5.3l compression
Launching!
Joined: Dec 2008
Posts: 206
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From: Hammond,La
as far as ive read it shouldnt change at all the only difference in the 4.8 and 5.3 short block is the crank(stroke length). i think the heads are different though the 4.8s should make a good bit more compression
You are correct, the 4.8 piston is flattop and the 5.3 is dished. The truck guys often swap in 4.8 pistons into their 5.3 engines to raise the CR. I can't remember how much, but I think it was either a 1/4 or a 1/2 CR point. Check out the performance truck part of the forum, I know I've seen this over there.
Thread Starter
Teching In
Joined: Aug 2006
Posts: 16
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thanks alot for the info I am trying to decide if it would be better cost wise to put the 4.8l pistons in or have the block bored to run 5.7l pistons . I will check out the truck forum as you said thanks again!
